Power supplies have large capacitors in them. These capacitors store electricity in them even when mains power is shut off. If you were to touch the connections on the bottom of the capacitors, you could receive a potentially lethal shock. For this reason, you should never disassemble a power supply unless you have received training in how to properly discharge the capacitors.
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Because of the big electric charge held within the capacitors inside it.
Computer power supplies have very large capacitors (elements that store charge) that could give you a very powerful shock if you managed to discharge them. They're like batteries that let go of all their charge at once.
Capacitors store energy (power) for an indefinite time. Touching both leads of any charged capacitor can give you a real good jolt.
For example, the tube of an old-fashioned television set is a giant capacitor in electronic terms: even though a TV may have just been switched off and unplugged, there may still be about 40,000 volts stored up in its cathode ray tube (CRT) that will cause great harm unless proper precautions are taken to discharge it safely.
Because power supplies have several large capacitors. A capacitor's job is to store energy. So, even when the power supply is unplugged, the capacitors carry a stored charge that could shock you.
Uninterruptable Powersupply
A DC motor generates power when it is rotating even when no supply is connected.
In general no, it might do some damage to both the equipment and the power supply. In certain specific cases it might be all right if you are able to measure the current to make sure it is 500 mA or less, and you can also ensure that the appliance can withstand 15 v.
Have the new valve in hand. Cut the toilet water supply off at the commode, or even at the street meter box.Remove water tube or pipe supply and old flush valve. Install new valve and new supply line if required.
Batteries are essential components in a substation. They provide the (tripping) current by which protective relays can trip high-voltage circuit breakers in the event of a fault. This means that the circuit breakers can trip even if the substation itself has lost its ancillary AC power supply.
because the power still are in circuit of the motherboard and you have to drain the system
A computers power supply can cause a shock even when unplugged but it's not dangerous. The monitor stores enough power to kill for many years after being unplugged. Never open the case of a monitor.
Power supplies are the most common failure point in a PC. Check for these:Broken Power supply unit (even if nearly new)Lack of power in the cableBlown fuse20 or 24 pin ATX power connector not seated correctly4 pin CPU power cable not seated correctlycable from front panel power switch to motherboard connector disconnected
computer
computer
a power supply (eg: battery) and a load (eg: resistor) even a piece wire shorting two terminals of the power supply is a closed circuit
Case: Your motherboard must be able to fit in your case and must support your motherboard size (correctly placed standoffs). Power Supply: You can't have a shortage of power or else your power supply will get overloaded and "die", or even possibly explode for that matter.
The capacitors in the power supply may still be 'charged' - and give off a powerful shock if touched.
When working inside a monitor, inside a power supply or inside another high voltage peripheral such as a laser printer or scanner. The reason is that these components contain a powerful electrical charge even after they are disconnected from power. You don't want to be grounded because you provide yourself as a conduit for the voltage to discharge through, which would suck.
Uninterruptable Powersupply
The electronics inside of the power supply will overheat and cause the power supply to quit working. There might even be a small fire inside, or the semiconductors may crack or explode. So it is best to repair or replace the power supply when the fan starts to malfunction, since it will be easier to fix. If you must operate it that way, you should take steps to reduce power consumption and make sure the fan is running each time. Some even insert things in there to start the fan if it is stalled, though that has its risks.
no